||It has been suggested that this article be merged into Chin. (Discuss) Proposed since August 2016.|
The terms cleft chin, chin cleft, dimple chin, or chin dimple, refer to a dimple on the chin. It is a Y-shaped fissure on the chin with an underlying bony peculiarity. Specifically, the chin fissure follows the fissure in the lower jaw bone that resulted from the incomplete fusion of the left and right halves of the jaw bone, or muscle, during the embryonal and fetal development. For other individuals, it can develop over time, often because one half of the jaw is longer than the other, leading to facial asymmetry.
This is an inherited trait in humans, where the dominant gene causes the cleft chin, while the recessive genotype presents without a cleft. However, it is also a classic example for variable penetrance with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype. Cleft chins are common among people originating from Europe and the Middle East.
In Persian literature, the chin dimple is considered a factor of beauty, and is metaphorically referred to as "the chin pit" or "the chin well": a well in which the poor lover is fallen and trapped.
- Mammalian Phenotype Browser:Cleft chin
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- Rob Roy, pg. 229 (in 1872 edition, pub. Osgood); by Sir Walter Scott, 1817.
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- چاه زنخدان the chin well